Novel catalytic bromolactonization of alkenoic acids using iodobenzene and Oxone®
作者:Yan He、Ye Pu、Bo Shao、Jie Yan
DOI:10.1002/jhet.617
日期:2011.5
The novelcatalytic reaction for bromolactonization of alkenoicacids is reported. When iodobenzene is used as recyclable catalyst in combination with Oxone® as terminal oxidant, the cyclization of various 4‐pentenoic acids with sodium bromide is easily carried out in CF3CH2OH at room temperature and giving five‐membered bromolactones in good yields. J. Heterocyclic Chem., 2011.
Selenium-Catalyzed Halolactonization: Nucleophilic Activation of Electrophilic Halogenating Reagents
作者:Shelli R. Mellegaard、Jon A. Tunge
DOI:10.1021/jo048460o
日期:2004.12.1
Diphenyl diselenide catalyzes the halolactonization of unsaturated acids with N-halosuccinimides under mild conditions. The diselenide not only accelerates the reactions, but in some cases affords regiocontrol in favor of gamma-lactone products. Experiments show that the regioselectivity in favor of gamma-lactones is a result of kinetic rather than thermodynamic control.
Halocyclizations: The cyclization of heterocyclic olefinic amides and ureas